Gee,
I had to ask. Just in case you managed to find a way to set the lens up to take those schooling jacks and other wide shots. Just wishful thinking on my part.
Below are some shots I have taken with the Micro Fisheye lens. With some observations/comments for everyone's consumption.
This shot of a Rhinopias had to be cropped as the corners were soft. Some of the softness is still visible.
This shot of nudi also had to be cropped. Again because of the soft corners that are inherent with this lens.
Diver shot with stonefish. This lens was made for these types of shots.
Again notice the soft corners.
When I fill the frame with a subject without room for cropping, the soft corners are even more evident.
This shot of a mimic octopus and wonderpus in a turf dispute was not cropped. I had to back off a little to get both subject inside the frame.
This is what the corners on this lens looks like without cropping. I did not have time to remove the lens and just shoot with the native lens. I think that would have had better results.
Typical shot of a blenny in a pipe. This lens put the subject in its environment better than the usual macro lens.
The following two shots could have been taken with just the native lens set on macro but the environment would not have been as well represented in the image.
Surprisingly, the corners look alright in with the anemone.
So far, seems to me that it is best to leave enough room for cropping the corners when composing with this particular lens. It has predictably soft corners and so the image should be framed accordingly at the time the shutter is tripped.